Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quando o canal 83 em Cingapura foi lançado?
 ###Tabelas: CREATE TABLE round_12 (round_12_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Venue VARCHAR, Crowd INT, Date VARCHAR) CREATE TABLE broadcast_rights (broadcast_rights_id AUTO_INCREMENT PRIMARY KEY, Territory VARCHAR, Broadcaster VARCHAR, Channel INT, Launched VARCHAR, Closed VARCHAR) CREATE TABLE european_tour_professional_career_summary (european_tour_professional_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Starts INT, Cuts made INT, Wins INT, Top 10 INT, Top 25 INT, Earnings (€) INT, Money list rank INT) CREATE TABLE belfast_and_county_down_railway (belfast_and_county_down_railway_id AUTO_INCREMENT PRIMARY KEY, Type VARCHAR, Fleet numbers VARCHAR, Quantity made VARCHAR, Manufacturer VARCHAR, Date made VARCHAR) CREATE TABLE tour_de_france_stage_finishes (tour_de_france_stage_finishes_id AUTO_INCREMENT PRIMARY KEY, Year INT, Stage INT, Start of stage VARCHAR, Distance (km) VARCHAR, Category VARCHAR, Stage winner VARCHAR, Yellow jersey VARCHAR)  
SELECT Launched FROM broadcast_rights WHERE Territory = singapore AND Channel = 83